Quadratic Recurrence Equation
A quadratic recurrence is a recurrence equation on a sequence of numbers {x_n} expressing x_n as a second-degree polynomial in x_k with k<n. For example,
| x_n=x_(n-1)x_(n-2) |
is a quadratic recurrence equation.
A quadratic recurrence equation of the form
| x_n=ax_(n-1)^2+bx_(n-1)+c |
in which no cross terms are present is known as a quadratic map.
See also
Julia Set, Linear Recurrence Equation, Logistic Map, Mandelbrot Set, Quadratic Map, Recurrence Equation, Sylvester's SequenceExplore with Wolfram|Alpha
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Weisstein, Eric W. "Quadratic Recurrence Equation." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/QuadraticRecurrenceEquation.html